Storage of tokens. The effect of XSS

Using HttpOnly cookies in React \u0026 Node - Storing JWT Tokens or SessionID Securely

OAuth adds additional attack vectors without providing any additional value and should be avoided in favor of a traditional cookie-based approach.

When the SPA calls multiple APIs that reside in a different domain, access, and optionally, refresh tokens are needed.

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A protocol needs to be established between the backend and the SPA to allow the secure transfer of the token from the backend to the SPA. Storage of tokens you have a SPA with no corresponding backend server, your SPA should request new tokens on login and store them in memory without any persistence. Browser in-memory scenarios Auth0 recommends storing tokens in browser memory as the most secure option.

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Using Web Workers to handle the transmission and storage of tokens is the best way to protect the tokens, as Web Workers run in a separate global scope than the rest of the application. If you cannot use Web Workers, Auth0 recommends as an alternative that you use JavaScript closures to emulate private methods.

If you compare these approaches, both receive a JWT down to the browser. Both are simple to pass back up to your protected APIs. The difference is in the medium.

The in-memory method for browser storage does not provide persistence across page refreshes and browser tabs. Browser local storage scenarios Using browser local storage can be a viable alternative to mechanisms that require retrieving the access token from an iframe and to cookie-based authentication across domains when these are not possible due to browser restrictions for example, ITP2.

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Storing tokens in browser local storage provides persistence across page refreshes and browser storage of tokens, however if storage of tokens attacker can achieve running JavaScript in the SPA using a cross-site scripting XSS attack, they can retrieve the tokens stored in local storage.

To reduce security risks if your SPA is using implicit we recommend using authorization code flow with PKCE instead or hybrid flows, you can reduce the absolute token expiration time. This reduces the impact of a reflected XSS attack but not of a persistent one.

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Reduce the amount of third-party JavaScript code included from a source outside your domain to the storage of tokens needed such as links to jQuery, Bootstrap, Google Analytics etc.

Performing Subresource Integrity SRI checking in third-party scripts where possible to verify that the resources fetched are delivered without unexpected manipulation is also more secure. Keep reading.

Hi, I'm Philippe, and I help developers protect companies through better web security. As the founder of Pragmatic Web Security, I travel the world to teach practitioners the ins and outs of building secure software. Want to learn more about OAuth 2. Save yourself days of storage of tokens through dozens of specs with this online course Resources Articles Why avoiding LocalStorage for tokens is the wrong solution Why avoiding LocalStorage for tokens is the wrong solution Most developers are afraid of storing tokens in LocalStorage due to XSS attacks. While LocalStorage is easy to access, the problem actually runs a lot deeper.